pthread_once      210 compat/os2threads.h static av_always_inline int pthread_once(pthread_once_t *once_control,
pthread_once      130 compat/w32pthreads.h static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
pthread_once      140 libavutil/thread.h #define pthread_once           strict_pthread_once